So I have a set of old cabinets in my garage for blasting tunes when I'm raging on my E30. I got them from a friend for free but the mid-range speakers were blown. Originally I had gutted the speaker cage and cut it to fit a small shitty computer speaker I happened to have lying around...

I opened up the hole to 5.25" with a jig saw and I snipped the wire that was part of the cross over coil just for good measure and attached the leads directly to the inputs going to the speaker coil...